Assembly of subassemblies having a mating bond interface for a motor vehicle

Abstract

An assembly of subassemblies having a mating bond interface for a motor vehicle is provided. The assembly includes a first subassembly of molded composite material and a second subassembly of molded composite material. An adjustable mating interface couples the subassemblies together. The interface includes a groove and a flange disposed on the first subassembly and bonded within the groove. The groove is sized and shaped relative to the size and shape of the flange to allow a bonding position of the flange within the groove to be adjusted during assembly of the subassemblies so that the mating interface is adjustable.

Claims

1. An assembly of subassemblies having a mating bond interface for a motor vehicle, the assembly comprising: a composite molded first subassembly; a composite molded second subassembly; and an adjustable mating interface for coupling the subassemblies together, the interface including a groove and a first flange disposed on the first subassembly and bonded within the groove wherein the groove is sized and shaped relative to the size and shape of the first flange to allow a bonding position of the first flange within the groove to be adjusted during assembly of the subassemblies so that the mating interface is adjustable wherein the first subassembly includes a first opening which extends into an interior of the first subassembly from an exterior of the first subassembly, the first flange extending about the periphery of the first opening.

2. The assembly as claimed in claim 1 wherein the second subassembly includes a second opening which extends into an interior of the second subassembly from an exterior of the second subassembly, the groove of the interface extending about the periphery of the second opening and wherein the openings are in fluid communication with one another.

3. The assembly as claimed in claim 1 wherein the first and second subassemblies are adhesively bonded together by an adhesive disposed within the groove.

4. The assembly as claimed in claim 1 wherein the composite material of the first and second subassemblies comprises multiple plies of fiber-reinforced composite material.

5. The assembly as claimed in claim 4 wherein the composite material is carbon-fiber reinforced plastic (CFRP).

6. The assembly as claimed in claim 1 wherein the interface includes a second flange received within the first opening for locating the subassemblies relative to each other during assembly of the subassemblies.

7. The assembly as claimed in claim 1 wherein the composite material of the first and second subassemblies comprises multiple layers of fiber, prepreg sheets which are compression molded.

8. The assembly as claimed in claim 7 wherein each of the subassemblies is made of woven carbon fiber, prepreg material.

9. The assembly as claimed in claim 2 wherein exterior surfaces of the subassemblies are class A, automotive vehicle surfaces.

10. The assembly as claimed in claim 1 wherein the second subassembly includes a second opening which extends into an interior of the second subassembly from an exterior of the second subassembly, wherein the first opening of the first subassembly and the second opening of the second subassembly are in fluid communication with one another; and the interface further includes a second flange disposed on the second subassembly, the second flange extending about the periphery of the second opening of the second subassembly and at least partially defining the groove, and the second flange being received within the first opening of the first subassembly for locating the subassemblies relative to each other during assembling of the subassemblies.

Description

BRIEF DESCRIPTION OF THE DRAWING FIGURES

(1) FIG. 1 is an environmental view of a spoiler assembly constructed in accordance with at least one embodiment of the invention and which is mounted on the rear end of an automotive vehicle;

(2) FIG. 2 is a view, partially broken away, of one end of the spoiler assembly of FIG. 1 shown mounted on the vehicle;

(3) FIG. 3 is an exploded perspective view of the spoiler assembly of FIGS. 1 and 2 including mounting hardware constructed in accordance with at least one embodiment of the present invention;

(4) FIG. 4A is an exploded perspective view of inner and outer molded, curved panels or components which are adhesively bonded together to form an end cap subassembly for assembly at one end of a wing subassembly;

(5) FIG. 4B is a view similar to the view of FIG. 4A but illustrating an end cap subassembly for assembly at the opposite end of the wing subassembly;

(6) FIG. 5 is an exploded perspective view of upper and lower molded curved panels or components which are adhesively bonded together to form the wing subassembly for assembly with the right hand (RH) and left hand (LH) end cap subassemblies of FIGS. 4A and 4B;

(7) FIG. 6 is an exploded perspective view, partially broken away, taken along lines 6-6 of FIG. 5 of adhesive bond interfaces between the upper and lower wing components;

(8) FIG. 7 is a perspective view, partially broken away, of one end of the spoiler assembly;

(9) FIG. 8 is a view, partially broken away and in cross section, taken along lines 8-8 of FIG. 7 and showing a nominal bond position of a mating interface between the wing subassembly and the end cap subassembly;

(10) FIG. 9 is a view similar to the view of FIG. 8 taken along lines 9-9 of FIG. 7 but showing a bond position which is offset (i.e. about 5 mm) from the nominal bond position of FIG. 8;

(11) FIG. 10 is a bottom perspective view of the spoiler assembly of FIG. 3 after bonding and assembly and further illustrating center and LH/RH stanchion subassemblies and mounting hardware;

(12) FIG. 11 is an enlarged bottom view, partially broken away, of an outer mating surface of the lower wing half wherein dimensional control features which act as cross-car (c/c) and fore-aft (F/A) locating features are illustrated at arrows;

(13) FIG. 12 is a top perspective view of a mating surface of the center stanchion and illustrating locating features on the center stanchion which correspond to the locating features on the lower wing half;

(14) FIG. 13 is a bottom perspective view, particularly broken away, of the spoiler assembly including the center stanchion mounted on the outer surface of the lower wing half or component and ready to be mounted on the vehicle of FIG. 1;

(15) FIG. 14 is an enlarged, bottom perspective view, partially broken away, of the center stanchion mounted to the lower wing half and with inner structural features indicated by phantom lines;

(16) FIG. 15 is a top perspective view, partially broken away, of the top of the center stanchion which interfaces with the lower surface of the lower wing half wherein arrows indicate locating features;

(17) FIG. 16 is a view similar to the view of FIG. 12 but showing via arrows the locating features of one of the RH or LH stanchions and without mounting hardware;

(18) FIG. 17 is a view similar to the view of FIG. 11 but showing via arrows the locating features on the outer surface of the lower wing half for one of the RH or LH stanchions;

(19) FIG. 18 is a view similar to the view of FIG. 13 but for one of the RH or LH stanchions;

(20) FIG. 19 is an enlarged view, partially broken away, which shows via phantom lines how the stanchion of FIG. 18 is mounted to the lower wing half;

(21) FIG. 20 is a view similar to the view of FIG. 15 and illustrating via arrows the dimensional control features formed at the top of one of the RH or LH stanchions;

(22) FIG. 21 is a side view, partially broken away and in cross-section, of the center, hollow, injection molded stanchion including mounting hardware attached to the lower wing half and a back panel of the vehicle;

(23) FIG. 22 is an enlarged view, partially broken away and in cross-section, showing in detail a bolt, a nut, a bolt sleeve or spacer and a washer for securing the stanchion to the lower wing half including an optional post-molded support and pin to provide further support;

(24) FIG. 23 is an enlarged view, taken within the phantom circle shown in FIG. 22, illustrating the various layers of fiber, pre-preg sheets which are compression molded to form the lower wing half and its nut and washer holder or cage and further illustrating the multiple veneer and structural plies of fabric material;

(25) FIG. 24 is an enlarged bottom perspective view, partially broken away, which shows various fastening features (including some via phantom lines) included in the molding and assembly processes to secure one of the RH or LH stanchions to the lower wing half;

(26) FIG. 25 is a view similar to the view of FIG. 24 taken along lines 25-25 in FIG. 24 but showing the wing subassembly and mounting hardware in section to show the insert molded nut and washer holders or cages in relation to the mounting hardware;

(27) FIG. 26 is a bottom perspective view of one of the RH or LH stanchions and particularly showing the fasteners for fastening the stanchion to the vehicle;

(28) FIG. 27 is a view similar to the view of FIG. 26 but further illustrating the mounting fasteners;

(29) FIG. 28 is a side, exploded perspective view of one of the LH or RH injection molded stanchions together with its injection molded mounting base and mounting hardware;

(30) FIG. 29 is a top perspective view of the stanchion subassembly of FIG. 28 but with the mounting base and hardware assembled in the stanchion outer member via phantom lines; and

(31) FIG. 30 is another top perspective view of the stanchion subassembly of FIGS. 28 and 29 assembled with its mounting hardware.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(32) As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.

(33) Referring now to FIGS. 1, 2 and 3, here is illustrated a spoiler assembly, generally includes at 10, mounted on the rear portion or panel 11 of an automotive vehicle 12. The spoiler assembly 10 includes a hollow wing subassembly, generally indicated at 14, and a pair of hollow end cap subassemblies, generally indicated at 16, which are adhesively bonded at opposite ends 18 of the wing subassembly 14. The end cap subassemblies 16 includes right hand (RH) and left hand (LH) subassemblies which are symmetrically opposite to each other.

(34) The wing subassembly 14 is supported above the upper surface of the rear portion of the vehicle 12 by left and right hand hollow stanchion subassemblies or pedestals, generally indicated at 20, and a hollow center stanchion subassembly, generally indicated at 22. Each of the stanchion subassemblies 20 and 22 includes an injection molded outer member 21 and 23, respectively, for securing the assemblies 20 and 22 to the wing subassembly 14, and an injection molded inner member 24 and 26, respectively, for securing the stanchion subassemblies 20 and 22, respectively, to the vehicle 12.

(35) The stanchion subassemblies 20 include RH and LH stanchion subassemblies which are symmetrically opposite to each other. Hardware is the form of nuts 13, elongated bolts 15, elongated bolt sleeves 17, and washers 19 are used to secure the stanchion subassemblies 20 and 22 to the wing subassembly 14 and the rear portion 11 of the vehicle 12. The sleeves function as load bearing spacers to allow load requirements for the stanchions to be met since the thin wall region(s) of the stanchions are not able to do so since they are relatively thin (about 1 mm). The injection molding process allows for an acceptable class A surface finish of the exterior surfaces of the stanchion.

(36) Previous stanchions typically were solid injection molded parts or milled/cast steel/aluminum parts to meet loading requirements for the stanchions. A problem with solid injection molded parts is that such parts do not yield an acceptable surface finish due to the relatively large cross-sections of such parts.

(37) By making the stanchions subassemblies 20 and 22 hollow, the stanchion subassemblies exhibit a class A surface finish, are light weight yet structurally rigid to meet loading requirements. By using standard, thin wall injection molding techniques together with the sleeves (i.e. load bearing spacers), the stanchion subassemblies 20 and 22 provide solutions to the problems with prior art stanchions.

(38) The outer members 21 and 23 and the inner members 24 and 26 are preferably formed from PC-ABS which enables the stanchion subassemblies to be thin-wall injection molded. PC/ABS (Polycarbonate/Acrylonitrile Butadiene Styrene) is a blend of PC and ABS which provides a unique combination of the high processability of ABS with the excellent mechanical properties, impact and heat resistance of PC.

(39) Referring now to FIGS. 4A and 4B, exploded views of the right hand and the left hand end cap subassemblies 16 are shown. Each subassembly 16 includes a composite molded outer component 30 and a mating composite molded inner component 32, which are bonded together by an adhesive 34 at their outer peripheries to form its respective subassembly 16. The adhesive 34 is positioned at an outer peripheral mating interface 35 between the components 30 and 32. Each of the inner components 32 includes an opening 36 and an integrally formed locating flange 38 which extends about the entire periphery of its respective opening 36. An exterior surface 40 of each of the outer components 30 is a class A, automotive vehicle surface. An exterior surface 42 of each of the inner components 32 is also a class A, automotive vehicle surface.

(40) Each of inner and outer components 30 and 32 is preferably compression molded and is preferably formed by three plies or layers of fiber-reinforced composite material such as carbon-fiber reinforced plastic (CFRP). Each of the plies is preferably a woven mat of carbon fibers in an epoxy resin matrix. The two outer plies are 3K “veneer” plies and the middle ply is a 12K “structural” plie. The fibers are collected into thread-like bundles called “tows” which are wound onto large bobbins. Standard tow sizes are 1K, 3K, 6K, and 12K. The K designation means “thousands of filaments per tow.” For example, a 3K fabric has 3,000 carbon fiber filaments per tow and a 6K fabric has 6,000 filaments per tow. The weaver loads the tows onto a loom where they are woven into a fabric. The most common forms of fabric are: Woven (plain weave, twill, satin) Unidirectional, Multidirectional (biaxial, triaxial, quasi-isotropic) Nonwoven (chopped or continuous strand mats)

(41) Referring now to FIGS. 5 and 6, there is illustrated an exploded view of mating upper and lower wing halves 44 and 46, respectively, of the wing subassembly 14. The wing halves 44 and 46 are bonded together at their outer perimeters (i.e. mating interface) by an adhesive 48. The inner surface of the upper wing half 44 includes a flange 50 which is received and retained within a trench or groove 51 formed in the inner surface 52 of the lower wing half 46 and bonded thereto by an adhesive at the mating surfaces of the wing halves 44 and 46. Exterior surfaces 45 and 47 of the wing halves 44 and 46, respectively, are class A surfaces. The exterior surface 47 of the lower wing half 46 has molded therein dimensional control features as described herein-below. The lower wing half 46 is compression molded to form raised and lowered features 49 at its inner surface 52 which features are complementarily formed at its outer surface 47 as described below.

(42) As in the case of the end cap components 30 and 32, the wing halves 44 and 46 are compression molded and are preferably formed by three plies or layers of fiber-reinforced, composite material such as CFRP (i.e. 2 outer veneer plies and a 12K inner structural ply).

(43) Referring now to FIGS. 7-9, there is illustrated in FIG. 7 the wing subassembly 14 and one of the end cap subassemblies 16 bonded at one end 18 of the subassembly 14 and which is supported by one of the stanchion subassemblies 20. FIG. 8 shows an adjustable bond or mating interface between the composite materials which make up the one end 18 of the wing subassembly 14 and the inner component 32 of the subassembly 16. Part of the interface includes a curved flange 58 disposed on and integrally formed at the end 18 of the upper wing half 44 and also includes a trench or groove 60 integrally formed about the opening 36 of the inner component 32. The interface also includes the flange 38 which at least partially defines the groove 60 and which extends into an opening 62 formed between and by the wing halves 44 and 46.

(44) Still referring to FIG. 8, part of the adjustable bond or mating interface includes a flange 64 disposed on and integrally formed at the end 18 of the lower wing half 46 and also includes the trench or groove 60. The interface provides for a nominal bonding position between the subassembly 14 and the subassembly 16 as shown in FIG. 8 and an offset bonding position as shown in FIG. 9. The bonding position of FIG. 8 may be offset by, for example, 5 mm in FIG. 9 from the nominal bonding position shown in FIG. 8.

(45) The adjustability of the mating interface allows one to adjust the bonding process during the assembly of the subassembly 14 to the subassembly 16 via an adhesive (not shown) or other bonding mechanism. Previous bonding processes required a very tight molding tolerance and thus needed more complex tooling and post-molding operations for surface preparations for such composite materials. The adjustable mating interface of at least one embodiment of the present invention allows a bonding position of the flange 58 and the flange 64 within the groove 60 to be adjusted during assembly of the subassembly 14 with the subassembly 16. In this way, the mating interface is adjustable. This allows for a larger window for dimensional adjustability and the ability to fine tune the appearance of the complete assembly 10. Also, the mating interfaces of the prior art are visible bond interfaces that are aesthetically unappealing. Interfaces of at least one embodiment of the invention save cost of tooling/labor and cost/timing to complete dimensional validation processes which are often required. The interfaces of at least one embodiment of the invention also allows for reduction in fiber stress and better control of the fiber weave during the layup process hereby allowing for a better appearance for the complete assembly 10.

(46) Referring now to FIG. 10, there is illustrated a bottom, schematic view of the assembly 10 which is constructed and assembled in accordance with an embodiment of the invention. FIGS. 11-15 particularly illustrate molded-in, dimensional control features in the form of side notches 70 and a top notch 72 compression molded in an inner peripheral rim 73 at the outer surface 47 of the lower wing half 46. The side notches 70 are cross-car (C/C) locating features for the mating subassemblies of the assembly 10 and the top notch 72 acts as a fore-Aft (F/A) locating feature for the mating subassemblies. One of the mating subassemblies is the wing subassembly 14 which includes at its lower wing half 46, the side notches 70 and the top notch 72 (and a bottom notch (not shown)) and the other of the mating subassemblies is the stanchion subassembly 22 which includes the outer member 23 of the center stanchion subassembly 22. The outer member 23 includes molded-in side flanges 76 or tabs which are fit within and contact the walls of the side notches 70. The top and bottom flanges 74 are fit within and contact the walls of the top and bottom notches 72. The notches 70 and 72 formed in the rim 73 are incorporated in the composite molding process to increase dimensional consistency of the overall assembly 10. The notches 70 and 72 act as part of a dimensional datum control plan.

(47) Previously, dimensional features required post-molding operations which increased cost/labor/time. Molded-in notches 70 and 72 provide a more robust dimensional stack-up due to the reduced molding and processing steps thereby improving dimensional repeatability. Also, the molded-in locating features minimize variability in the final assembled position of the stanchion subassembly 22 relative to the wing subassembly 14. The dimensional control features molded in the lower wing half 46 thereby assist dimensional consistency and repeatability during the assembly process.

(48) Referring now to FIGS. 10-15 and FIGS. 21-23, as previously mentioned, the stanchion subassembly 22 also includes hardware to attach or fasten the subassembly 22 to the lower wing half 46 and the subassembly 22 to the back portion or panel 11 of the vehicle 10. The hardware also provides load bearing spacers. The hardware includes the nut 13, the elongated, threaded bolt 15, the elongated bolt sleeve 17 and the washer 19. The washer 19 and the nut 13 are insert molded within the lower wing half 46. The bolt 15 is received and retained within the bolt sleeve 17 which, in turn, is mounted within an aperture 88 which is formed in the inner member 26. The bolt 15 extends from the aperture 88, through the washer 19 and is threadedly received and retained within the internally threaded nut 13 which is held within a hollow, apertured cage 90 which is integrally molded at the lower surface 47 of the wing half 46. A bolt 94 threadedly secures the outer member 23 to the lower wing half 46.

(49) The outer walls which form the cage 90 has two structural plies 80 and 82 (i.e. a “sandwich” layup (12K, 12K)) at the lower wing half 46.

(50) Optionally, the hardware includes a post-molded support 92 and a rivet 95 which extends from the outer member 23 into the lower wing half 46 and helps holds the support 92 against the lower surface 47 of the lower wing half 46 to help secure the stanchion subassembly 22 to the lower wing half 46. The ability to insert mold the nut 17 and the washer 19 into the lower wing half 46 without the need for post-mold operations (ie. post-mold bonding via adhesives or other means) allows extremely accurate and repeatable fastening of the stanchion subassembly 22 to the lower wing half 46. In this way, dimensional inconsistencies are reduced by the composite molding process. Furthermore, time/cost/labor is reduced and the possibility of damaging late in the process cycle is reduced.

(51) Still referring to FIG. 13, there is illustrated a pair of fasteners 96 which may be insert or otherwise molded with the inner member 26. The fasteners 96 are typically used to fasten the inner member 26 and, consequently, the stanchion subassembly 22 to the vehicle 12 at the body panel 11.

(52) Referring now to FIGS. 16-20 and 24-30, there is illustrated a pair of left and right hollow stanchion subassemblies 20 and their mounting/fastening hardware. Parts/components of the stanchion subassemblies 20 which are the same or similar in either structure or function to the center stanchion subassembly 22 have the same reference number.

(53) While exemplary embodiments are described above, it is not intended that these embodiments describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention. Additionally, the features of various implementing embodiments may be combined to form further embodiments of the invention.